JP2877648B2 - Color liquid crystal display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal display panel, and more particularly to a negative type liquid crystal display panel having a color filter layer formed on a polarizing plate by screen printing.

[0002]

2. Description of the Related Art In general, a display method of a liquid crystal display element is roughly classified into a positive display in which black is displayed on a white background and a negative display in which white is displayed on a black background. In the negative display, a light source such as a lamp is provided on the back of the panel, and the background and OF are used for display.
In the F segment (non-selected segment), the incident light from the light source is shielded, and in the ON segment (selected segment), light is transmitted, so that good display is obtained in both bright and dark places. In addition, R.P. on the polarizing plate on the back side of the liquid crystal panel.
G. FIG. There is also a liquid crystal display panel in which color filters such as B are provided by screen printing to perform color display.

[0003]

In a conventional color liquid crystal display panel in which a color filter is screen-printed on a polarizing plate, the color filter is, as shown in FIG. Screen printing was performed so as to protrude from the edge. That is, in the conventional structure, since the peripheral edge of the polarizing plate overlaps with a part of the color filter, the ink of the color filter material permeates into the adhesive layer that adheres the polarizing plate and the glass substrate during screen printing, and heat is applied. When the test was performed, there was a problem that the polarizing plate was peeled from the corners of the polarizing plate in a curl shape. The reason for this is that, as described above, the ink of the color filter material penetrates into the adhesive layer between the polarizing plate and the glass substrate, and the adhesive strength of the adhesive layer is reduced and the ink is separated.

Since the adhesive for bonding the polarizing plate and the glass substrate is generally a silicone or polyester-based adhesive,
Ink is inevitably soaked during screen printing and this problem cannot be solved. The present invention has been made in view of the above-mentioned problem, and an object of the present invention is to prevent peeling of a polarizing plate by heat even when a color filter is provided on a polarizing plate by screen printing. It is to provide a color liquid crystal display panel which can be used.

[0005]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, a color liquid crystal display panel according to the present invention has a display electrode formed on a first transparent substrate,
A plurality of divided common electrodes are formed on a second transparent substrate disposed to face the substrate, and the first and / or
And a peripheral edge of a color filter layer of a color liquid crystal display panel in which a polarizing plate is adhered on the surface of the second transparent substrate and a color filter layer is formed by screen printing on the polarizing plate. It is characterized by being arranged on an area. Specifically, the present invention is characterized in that the peripheral edge of the color filter layer is arranged inside the peripheral edge of the polarizing plate and on the non-display area of the display panel.

[0006]

In the color liquid crystal display panel constructed as described above, the peripheral edge of the color filter layer formed on the polarizing plate is disposed within the peripheral edge of the polarizing plate, so that the color filter layer is formed. It is possible to prevent the ink from soaking into the adhesive for bonding the polarizing plate and the glass substrate during screen printing for forming the ink.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A color liquid crystal display panel according to the present invention will be described below with reference to the embodiments shown in FIGS. As shown in FIGS. 1 and 2, the color liquid crystal display panel of the present invention has a first transparent substrate (10) on which a display electrode (11) is formed and a second transparent substrate on which a common electrode (21) is formed. (20),
A polarizing plate (3) adhered to the surfaces of both substrates (10) and (20)
0) and (40) and a color filter (50) formed on one of the polarizing plates (30).

[0008] First and second transparent substrates (10) (2)
In (0), a glass substrate is used, and a display electrode (11) having a desired shape is formed of a transparent conductive material on a first substrate (10). On the other hand, a common electrode (21) divided into a desired shape by the same material is formed on the second substrate (20). In the non-display area on the common electrode (21), a light-shielding film (60) is formed of a metal such as nickel or an insulating material such as a resin for shielding light. This light shielding film (6
According to 0), light leakage in the non-display area can be prevented, and the display quality of the negative display can be improved.

An organic alignment film (not shown) for aligning liquid crystal is formed on both substrates (10) and (20) on which the electrodes (11) and (21) are formed. Then, the gap between the substrates (10) and (20) is controlled by the sealant (70) and integrated, and then liquid crystal is injected into the space to form a display panel. Both sides of the display panel, ie, the first,
A polarizing plate (30) is provided on the surface of the second substrate (10) (20).
(40) is attached. The polarizing axes of the polarizing plates (30) and (40) are arranged so as to be parallel, and the display panel performs a negative display in relation to the rubbing direction of the alignment film. That is, the display electrode (11) at the desired position and the common electrode (2)
When 1) is selected and a predetermined potential is applied, light from the light source passes through only the selected display pattern and is displayed.
On the other hand, the non-selected area is shielded from light by the polarizing plates (30) and (40), so that the contrast between the selected area and the non-selected area can be improved.

On one polarizing plate (30), a color filter (50) is formed by screen printing in order to enable color display. The feature of the present invention lies in the arrangement position of the color filter (50). That is, screen printing is performed such that the peripheral edge of the color filter (50) is located substantially the same as or inside the peripheral edge of the polarizing plate (30). Further, when screen printing the color filter (50), as described above, the color filter (5) is used.
It is important to arrange the peripheral edge of 0) on the polarizing plate (30) and on the non-display area of the display panel defined by the light shielding plate (60).

By arranging the peripheral edge of the color filter (50) inside the peripheral edge of the polarizing plate (30), the ink is applied to the polarizing plate (30) and the substrate (10) during screen printing of the color filter (50). ) Does not penetrate into the adhesive to be bonded, so that the problem of peeling from the corners of the polarizing plate during the thermal test can be solved.

[0012]

[Table 1]

Table 1 shows the results of a thermal test performed by the inventor of the present invention on both the display panel of the present invention and the display panel of the conventional structure. The thermal test conditions were 500 hours at 80 ° C, 200 hours at 100 ° C,
Perform at 100 ° C. for 100 hours, and adjust the thickness of the polarizing plate to 120 μm.
m, 180 μm, and 240 μm. As is clear from Table 1, in the structure of the present invention, even when the thickness of the polarizing plate was 120 μm, none of the 10 corners peeled off under all temperature conditions, whereas the conventional structure did not. All of the samples failed at 100 ° C. and 120 ° C. By increasing the film thickness, defects can be suppressed even with the conventional structure, but if the thickness of the polarizing plate is increased, the total thickness of the display panel becomes slightly thicker, and it is not preferable to use it positively. .

Further, it is apparent that the effect of applying the present invention to a polarizing plate having a thickness of 180 μm, 240 μm, etc. is the same as that of a polarizing plate having a thickness of 120 μm.

[0015]

As described in detail above, according to the present invention,
The peripheral edge of the color filter layer formed on the polarizing plate is disposed within the peripheral edge of the polarizing plate, so that the adhesive for bonding the polarizing plate and the glass substrate at the time of screen printing for forming the color filter layer can be used. Ink can be prevented from soaking. As a result, even if the display panel is used in a thermal environment, it is possible to eliminate the problem that the corners of the polarizing plate are peeled off. Can be secured.

[Brief description of the drawings]

FIG. 1 is a plan view showing the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view showing a conventional problem.

[Explanation of symbols]

 (10) (20) Transparent substrate (30) (40) Polarizing plate (50) Color filter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02F 1/1335 500 G02F 1/1335 510

Claims (2)

(57) [Claims] 1. A display electrode is formed on a first transparent substrate.
On the second transparent substrate disposed opposite to the substrate.
When the common electrode and the light shielding plate divided into
On the surface of the first or / and second transparent substrate
A polarizing plate is stuck on the polarizing plate and printed on the polarizing plate by printing.
Color liquid crystal display panel on which the color filter layer is formed.
And the peripheral edge of the color filter layer is defined as the peripheral edge of the polarizing plate.
Inside the display panel and in the non-display area of the display panel.
Characteristic liquid crystal display panel. 2. A display electrode is formed on a first transparent substrate.
On the second transparent substrate disposed opposite to the substrate.
When the common electrode and the light shielding plate divided into
On the surface of the first or / and second transparent substrate
A polarizing plate is stuck on the polarizing plate and printed on the polarizing plate by printing.
Color liquid crystal display panel on which the color filter layer is formed.
And The peripheral edge of the color filter layer is referred to as the peripheral edge of the polarizing plate.
Inside the display panel defined by the light shielding plate
Color liquid crystal display characterized by being arranged in a non-display area
panel.